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Worksheets20-21 FEBRUARY- SEX LINKED INHERITANCE
Total questions: 14
Worksheet time: 11mins
Name
Class
Date
1.
What percentage of the offspring will have this recessive disease?
a)
0%
b)
25%
c)
50%
d)
75%
2.
What percentage of the female offspring will be a carrier for this recessive disease?
a)
0%
b)
50%
c)
100%
d)
25%
3.
How many PAIRS of chromosomes do humans have?
a)
23
b)
46
c)
1
d)
2
4.
How many PAIRS of sex chromosomes do humans have?
a)
23
b)
46
c)
1
d)
2
5.
I have 2 X chromosomes. What am I?
a)
Male
b)
Female
6.
I have 1 X chromosome and 1 Y chromosome. What am I?
a)
Male
b)
Female
7.
If a gene is found only on the X chromosome and not the Y chromosome, it is said to be what?
a)
sex-linked trait
b)
polygenic trait
c)
codominant trait
d)
incomplete dominance trait
8.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a female who is a carrier for hemophilia?
Which genotype represents a female who is a carrier for hemophilia?
a)
XHXh
b)
XhXh
c)
XHXH
d)
XhY
9.
Hemophilia is a recessive x-linked disorder.
Which genotype represents a male with hemophilia?
Which genotype represents a male with hemophilia?
a)
XHXh
b)
XhXh
c)
XHY
d)
XhY
10.
H= normal blood clotting
h=hemophilia
hemophilia is a X-linked recessive disorder.
Female parent genotype XHXh
Male parent genotype XHY
What is the probability that any of their offspring will have hemophilia?
a)
4/4
b)
3/4
c)
2/4
d)
1/4
11.
Color blindness is X-Linked recessive disorder.
Look at this cross: XB XB x Xb Y
What proportion/percent of the male children are colorblind?
a)
100%
b)
75%
c)
25%
d)
0%
12.
Look at this cross: XBXb x XBY
What proportion of the male children are colorblind?
a)
100%
b)
75%
c)
50%
d)
25%
13.
What is the purpose of using a pedigree?
a)
To determine the average age of a family
b)
To find out family histories and medical records
c)
To find out whether a couple can have a boy or a girl
d)
To trace the inheritance of a certain trait through generations
14.
Which of the following genotypes belongs in the red box in the Punnett square?
a)
XBXb
b)
XbXb
c)
XbY
d)
XBY
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